Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.148: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Inelastic neutron scattering studies of two Mn(III)-based Single Molecule Magnets — •Oliver Pieper1,2, Joris van Slageren3, Tatiana Guidi1, Bella Lake1,2, Hannu Mutka4, Margarita Russina1, Alexander Schnegg1, Alexandra Buchsteiner1, Constantinos J. Milios5, Euan K. Brechin5, and Anna Julia6 — 1Hahn-Meitner Institut, Glienicker Straße 100, 14109 Berlin — 2Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstraße 36, 10623 Berlin — 3Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart — 4Institut Laue-Langevin, 6, rue Jules Horowitz, BP 156 - 38042 Grenoble Cedex 9 - France — 5School of Chemistry, The University of Edinburgh, West Mains Road, UK — 6UBX Laboratory, Universitat de Barcelona, Spain
Recently, two new SMMs has been synthesised, with similar magnetic structures consisting of six Mn(III)-ions. While one of them contains two antiferromagnetically coupled triangles leading to a S=4 ground state and giving rise to frustration effects, the other consists of six ferromagnetically coupled ions leading to a S=12 ground state and a high anisotropy barrier.
Here we present recently performed inelastic neutron scattering measurements that allowed us to observe magnetic excitations within the anisotropy split ground state multiplet. In addition a number of excitations to lower lying multiplets with different total S have been found. We will discuss the energy level diagram and its relevance to quantum tunnelling in these molecules.